Search for the $ {B}_s^0 $→ μ$^{+}$μ$^{−}$γ decay

arXiv (Cornell University)

Abstract

A search for the fully reconstructed $B_s^0 \rightarrow \mu^+\mu^-\gamma$ decay is performed at the LHCb experiment using proton-proton collisions at $\sqrt{s}=13$\,TeV corresponding to an integrated luminosity of $5.4\,\mathrm{fb^{-1}}$. No significant signal is found and upper limits on the branching fraction in intervals of the dimuon mass are set \begin{align} {\cal B}(B_s^0 \rightarrow \mu^+\mu^-\gamma) < 4.2\times10^{-8},~&m(\mu\mu)\in[2m_\mu,~1.70]\,\mathrm{GeV/c^2} ,\nonumber {\cal B}(B_s^0 \rightarrow \mu^+\mu^-\gamma) < 7.7\times10^{-8},~&m(\mu\mu)\in[1.70,~2.88]\,\mathrm{GeV/c^2},\nonumber {\cal B}(B_s^0 \rightarrow \mu^+\mu^-\gamma) < 4.2\times10^{-8},~&m(\mu\mu)\in[3.92 ,~m_{B_s^0}]\,\mathrm{GeV/c^2},\nonumber \end{align} at 95\% confidence level. Additionally, upper limits are set on the branching fraction in the $[2m_\mu,~1.70]\,\mathrm{GeV/c^2}$ dimuon mass region excluding the contribution from the intermediate $\phi(1020)$ meson, and in the region combining all dimuon-mass intervals.

Authors 19

1. A. A. Adefisoye
2. C. Agapopoulou

   Laboratoire de Physique de Clermont Auvergne

   Affiliation as printed

   LPC - Laboratoire de Physique de Clermont (Campus Universitaire des Cézeaux, 4 Avenue Blaise Pascal, TSA 60026, CS 6002, 63178 Aubière Cedex - France)

3. C. Aidala
4. S. Akar
5. R. Amalric
6. S. Amato

   Laboratoire de Physique des 2 Infinis Irène Joliot-Curie

   Affiliation as printed

   IJCLab - Laboratoire de Physique des 2 Infinis Irène Joliot-Curie (Bât. 100 et 200, 15 rue Georges Clémenceau 91405 Orsay - France)

7. Liupan An
8. D. Ao
9. J. M. Basels Aachen

   RWTH Aachen University

   Affiliation as printed

   RWTH Aachen

10. K. Belous
11. I. Belyaev
12. G. Bencivenni
13. E. Ben-Haim
14. Alexander Berezhnoy
15. Ia. Bezshyiko
16. P. Billoir

    Laboratoire d’Annecy de Physique des Particules

    Affiliation as printed

    LAPP - Laboratoire d'Annecy de Physique des Particules (9 Chemin de Bellevue - BP 110 - 74941 Annecy-le-Vieux CEDEX - France - France)

17. Alice Biolchini
18. M. Birch
19. A. Bizzeti